AppCacheHost cache selection algorithm

webkit/appcache/appcache_backend_impl.h

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WEBKIT_APPCACHE_APPCACHE_BACKEND_IMPL_H_
 #define WEBKIT_APPCACHE_APPCACHE_BACKEND_IMPL_H_
 
-#include <map>
-
 #include "base/logging.h"
-#include "base/task.h"
+#include "base/hash_tables.h"
 #include "webkit/appcache/appcache_host.h"
-#include "webkit/appcache/appcache_interfaces.h"
 
 namespace appcache {
 
 class AppCacheService;
 
-typedef Callback2<Status, void*>::Type GetStatusCallback;
-typedef Callback2<bool, void*>::Type StartUpdateCallback;
-typedef Callback2<bool, void*>::Type SwapCacheCallback;
-
-class AppCacheBackendImpl : public AppCacheBackend {
+class AppCacheBackendImpl {
  public:
   AppCacheBackendImpl() : service_(NULL), frontend_(NULL), process_id_(0) {}
   ~AppCacheBackendImpl();
 
   void Initialize(AppCacheService* service,
                   AppCacheFrontend* frontend,
                   int process_id);
 
   int process_id() const { return process_id_; }
 
+  // Methods to support the AppCacheBackend interface. A false return
+  // value indicates an invalid host_id and that no action was taken
+  // by the backend impl.
+  bool RegisterHost(int host_id);
+  bool UnregisterHost(int host_id);
+  bool SelectCache(int host_id,
+                   const GURL& document_url,
+                   const int64 cache_document_was_loaded_from,
+                   const GURL& manifest_url);
+  bool MarkAsForeignEntry(int host_id, const GURL& document_url,
+                          int64 cache_document_was_loaded_from);
+  bool GetStatusWithCallback(int host_id, GetStatusCallback* callback,
+                             void* callback_param);
+  bool StartUpdateWithCallback(int host_id, StartUpdateCallback* callback,
+                               void* callback_param);
+  bool SwapCacheWithCallback(int host_id, SwapCacheCallback* callback,
+                             void* callback_param);
+
   // Returns a pointer to a registered host. The backend retains ownership.
   AppCacheHost* GetHost(int host_id) {
     HostMap::iterator it = hosts_.find(host_id);
-    return (it != hosts_.end()) ? &(it->second) : NULL;
+    return (it != hosts_.end()) ? (it->second) : NULL;
   }
 
-  typedef std::map<int, AppCacheHost> HostMap;
+  typedef base::hash_map<int, AppCacheHost*> HostMap;
   const HostMap& hosts() { return hosts_; }
 
-  // AppCacheBackend methods
-  virtual void RegisterHost(int host_id);
-  virtual void UnregisterHost(int host_id);
-  virtual void SelectCache(int host_id,
-                           const GURL& document_url,
-                           const int64 cache_document_was_loaded_from,
-                           const GURL& manifest_url);
-  virtual void MarkAsForeignEntry(int host_id, const GURL& document_url,
-                                  int64 cache_document_was_loaded_from);
-
-  // We don't use the sync variants in the backend, would block the IO thread.
-  virtual Status GetStatus(int host_id) { NOTREACHED(); return UNCACHED; }
-  virtual bool StartUpdate(int host_id) { NOTREACHED(); return false; }
-  virtual bool SwapCache(int host_id) { NOTREACHED(); return false; }
-
-  // Async variants of the sync methods defined in the backend interface.
-  void GetStatusWithCallback(int host_id, GetStatusCallback* callback,
-                             void* callback_param);
-  void StartUpdateWithCallback(int host_id, StartUpdateCallback* callback,
-                               void* callback_param);
-  void SwapCacheWithCallback(int host_id, SwapCacheCallback* callback,
-                             void* callback_param);
-
  private:
   AppCacheService* service_;
   AppCacheFrontend* frontend_;
   int process_id_;
   HostMap hosts_;
 };
 
 }  // namespace
 
 #endif  // WEBKIT_APPCACHE_APPCACHE_BACKEND_IMPL_H_